Concrete stairway construction



E. C. SWINDLER.

CONCRETE STAIRWAY CONSTRUCTION APPLICATION man MAR.29. 1920.

1,369,498. Patented Feb. 22, 1921.

4 E176 fm C. Sh//MM Hf' [rz/vena UNITEDSTATESA PATENT OFFICE.

EDGAR. C. SWINDLERgOF TACOMA, WASHINGTON, ASSIGNOR TO FRED RANDOLPH SMITH.

CONCRETE STAIRWAY CONSTRUCTION.

Specification of Letters Patent.

Patented Feb. 22, 1921.

To all whom it may concern Be it known that I, EDGAR C. SWINDLER, acitizen of the United States, and resident of the city of Tacoma, county of Pierce, and State of Washington, have invented certain new and useful Improvements .in Concrete' Stairway Construction, of whichthe following is a specification.

. This invention relates to improvements in stairway construction, and more particu-` larly to the construction ofvstairways wherein finished slabs of concrete, marble, or other suitable material, are supported upon a plurality of soffit supporting stringers to coperate with the soflit in forming a mold for receiving a filling of suitable plastic material, such as concrete, to form the body of the stairway.

The principal object of the invention is to provide a stairway of the above character, having treads and risers of an adjustable character which will permit variation in the v height or width of the steps without altera- Figure 1 is a vertical, sectional view of a portion of a stairway constructed according to the present invention, particularly illustrating the tie members for supportlng the risers in position for receiving the concretey filler.

Fig. 2 is a horizontal, sectional view of the stairway.

Referring more in detail to the drawings: l, 2 and 3 designate parallel, spaced apart stringers, preferably of wood, which are supported at their lower ends on a landing or floor, as indicated at 4, and extended upwardly therefrom, at the usual or any desired incline. A soiit 5 is supported by these stringers to form the floor or base of a mold for receiving the filling material.

In building stairways of this character, the lower step is formed first and the others formed successively from the first. Ordinarily such stairways are built between walls which form the ends or sides of the mold for the steps and in other cases suitable end forms are provided. y

In the present construction, a mold for each step is formed by its riser and tread; the riser being placed in position first, the interior then filled with the plastic filling, and the tread placed in position and embedded inthe filler. The steps are formed successively one upon the other, and when completed and the material has set, the supporting soflit and stringers maybe removed.

Each of the risers 7 is provided centrally and at its ends, or at spaced intervals, ac cording to the spacing ofthe stringers, with loops 8, which have their ends-embedded in or otherwise secured to the slabs so that the loops are exposedonthe inner faces thereof, and secured at their inner ends by means of nails or the like, 9, are tie rods -10 provided with hooks 11 at their outer ends which are extended into the loops 8 to hold the risers rigidly and securely in position while the concrete is being poured therein, and later serves as tie members for holding the slabs in place.

Each of the slabs 12 which form the treads of the steps, is supported at its outer longitudinal edge on a riser 7, and at its inner longitudinal edge is supported when the filler is beingpoured and before it becomes set, upon the upper or head ends of :spikes or the like, 13, that are driven vertically into the stringers. Loops 14 are also formed and extended from the under faces of the risers which are embedded in the filler material` while the latter is soft, so that later, after it is set, will hold the treads in place.

Each tread has a rounded dependin fiange, 15, along its forward edge whic overlaps its supporting riser and also forms an abutment for effecting proper positioning of the tread.

In arranging the treads and risers to receive the plastic filler, which in most cases would be concrete, it is apparent that the width of each step could be easily adjusted to Aany desired width by moving 'the superimposed riser outwardly toward the forward edge of the tread, and placing the nails 10 for securing the tie rods accordingly. To

dimensions, andan easy andrelatively inexgnsive construction is provided.

hat I claim as my Vinvention is:

Y1. In a stairway of the character described, a plurality ofi parallel, inclined stringere, a solit supported by the striiigers, spikes driven vertically into theV stringers -in transverse alinement thereof, riser and tread forming slabs arranged in Vsuperimposed relation to form steps in spaced relation to the sofiit, said treads .being supported at their inner edges on said vertically alined spikes and at their outer ends on said risers, said risers being mounted on the inner edges of said treads, tie rods securedto the said stringers andv treads to hold the latter in position While the stairway is being formed, and a plastic material'fllingthe space between the step-forming slabs and soiiit'.

2. Ina stairway ofthe character described, a plurality of spaced apart, parallel inclined stringers, a soilit supported by said` stringers, spikes or the like partly driven into said stringers at spaced intervals in transverse alinement thereoftread forming slabs supported in horizontal position at their inner edges by said transverselyV alined spikes, riser-forming slabs mounted on each of said treads and supporting the outer edges of thetread superimposed thereon, said risers havingr loops formed thereinrand extending at the inner faces thereof, tie rodssecured` in said loops and to said stringers to secure the y risers rat adjusted positions on the treads, and

a plastic material filling the space between the soiiit and step-forming slabs, for 'the pur- Y pose set forth. i Y

3. In a stairway of the'charaeter de scribed, aplurality of; inclined stringers, a

soflt supported by the stringers, spikes i driven partly into the strin ers in alinement transverselyH thereof, treat Y' forming slabs mounted at their inner edges Von said transversely alined spikes and havingV depending flanges at their outer edges, riser-forming slabs mounted'on the inner edgev of each of saidtreads abutting the flange and supporting the outer edges of the Vnext higher tread, hook receiving loops secured to said risers and extending from the inner faces thereof,

e tie rods having hooksat their outer ends seating inl said loops and having anchor inembers at their inner ends wherebyV they may be detachably secured to said Stringersto hold while the stairs are being vformedV and a plastic material filling the space between the steps and soflit. n K Signed at,Tacoma,`vPierce county, Washington, this 19th day of March, 1920.

,EDGAR c. sWiNDLER. u

Jthe risers at adjusted positions on the treads 

